A three-phase Y-A transformer is rated 225-kv: 24-kv, 400 MVA and has a single-phase equivalent series reactance of 6.08 Ω as referred to its high-voltage terminals. The transformer is supplying a load of 375 MVA at 0.89 power factor leading at a voltage of 24 kV (line to line) on its low-voltage side. It is supplied from a feeder whose impedance is 0.17 +/2.2 Ω connected to its high-voltage terminals. For these conditions; 3. i. draw the per-phase equivalent circuit diagram
ii. draw the per-phase phasor diagram
iii. calculate:
a. The line-to-line voltage at the high-voltage terminals of the transformer
b. The line-to-line voltage at the sending end of the feeder.